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  4. Which of the following has largest size?

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Q. Which of the following has largest size?

AIPMTAIPMT 1993The s-Block Elements

Solution:

$Na^-$ has largest size because anion is always larger than neutral atom and cation is smaller than neutral atom
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, Na^- > Na > Na^+$
$\, \, \, \, \, \, \, \, Anion > Parental atom > Cation$